iii. Solitary cyst like radiolucencies

IV. Solitary cyst like radiolucencies

1.Surgical defect

2.Residual cyst

3.Latent bone cyst

4.Odontogenic keratocyst

5.Nasopalatine duct cyst

6.Ameloblastma

7.Odontogenic fibroma

8.Central haemangioma

9.Central giant cell granuloma

1- Surgical defect

Asymptomatic

History of recent

surgery

Regress in size in

successive radiographs

2- Residual cyst

On edentulous ridge

May interfere with denture wearing

History of extraction

Previous radiographs

Location

Shape & periphery

Internal structure

Effect on

surrounding

structures

3-Latent bone cyst

Asymptomatic

Below the ID canal with

a corticated periphery

Does not increase in size

Sialography

4-Odontogenic keratocystDifferent growth pattern (PC, Solitary, Interradicular & multilocular)High recurrence rateAspiration: viscous, thick, cheesy material (keratin)In the mandibular body minimal BL expansion is apparent while severe expansion occur in the ramus

5- Nasopalatine canal cyst Swelling just posterior to the palatine papilla

Salty taste Numbness over the palatal mucosa

Well defined, corticated, round or heart shape, midline of the palate Root divergence and/or resorption

6- Ameloblastoma•Adult age (above 40years)•Male predilection, Mandible posterior region•Paraesthesia•Facial asymmetry•-ve Aspiration

•Expansion•Root resorption •Teeth displacement

6- Odontogenic fibroma

► young adults ►Female > male►Mand: molar-premolar►Asymptomatic Swelling►Teeth Displacement,

occasionally resorption

8- Central HaemangiomaYoung ageGingival bleedingThrobbing painRebound mobilityPulsatingMore commonly

multilocularSerpaginous tract

of I.A.C.

9- Central Giant Cell Granuloma

IV. Solitary radiolucencies with ragged, poorly

defined borders

Solitary ill defined radiolucencies• Chronic osteomyelitis• Sqamous cell carcinoma• Metastatic carcinoma• Osteogenic sarcoma• Fibrosarcoma• Fibrous dysplasia

Chronic osteomyelitisMore in posterior mandible

Signs & Symptoms of

chronic infection :

Intermittent and reccurent

episodes of swelling, pain, fever.

Lymphadenopathy (lymph

nodes tender, palpable & mobile)

Sinus draining pus

Paraesthesia

Squamous cell carcinomaOld ageS& S of malignancy (foul odour, ulceration , teeth loosened over a short period of time, L.N. enlarged, painless & fixed,…)

Saucer- shaped or irregular area of bone destructionDestruction of alveolar bone support of adjacent teeth (Teeth floating in space)Widening of PDL, loss of L.D.

Metastatic carcinoma

Old age

History of primary

tumor

Irregular areas of bone

destruction

Adjacent teeth floating

in space

Osteogenic sarcoma (osteolytic lesion)

Young adults

S & S of malignancy

Widening in periodontal membrane space

Loss of L.D.

Ill defined RL with ragged borders

Fibrosarcoma

Young adults

S & S of malignancy

Widening in P.M.S.

Loss of L.D.

Ill defined RL with ragged borders

Fibrous Dysplasia (Early stage)Maxilla>Mandible – Unilateral Young Children (<10ys)- neurologic symptpmsEarly RL, mostly mixed (Ground glass- Orange peel-

finger print appaerence), late RO.Ill defined RL blending with normal adjacent adjacent

boneCortical expansionObliteration of max. sinusUpward displacement of I.A.CThinning of PMSTeeth displacement

Unilateral Obliteration of max. sinus

Superior displacement of Inferior Alveolar canal

Fibrous Dysplasia (R.O. stage)